Pro Scooter Wheels & Bearings

Scooter wheels / Introduction

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Most pro scooter wheels are 100 mm or 110 mm in diameter. Some wheels go up to 125 mm and need a compatible fork.

Diameter affects how easily a wheel rolls over cracks and rough pavement. Larger wheels are great for commuting — they carry speed well and roll over obstacles more easily.

Smaller wheels fit most setups, weigh less and make the scooter more agile for tricks.

Urethane (polyurethane) is the material used for the riding surface — the same as on skateboard wheels. Hardness is measured on the durometer scale (often called “duro”). Harder wheels have less rolling resistance and work well on ramps and smooth pavement. Softer wheels feel smoother on rough asphalt and long rides, but they wear down faster.

Scooter wheels / Bearings

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Bearings let your wheels spin freely with minimal friction. Each bearing has 6–8 balls held between an inner and outer race, kept evenly spaced by a retainer. Shields help keep dirt out.

You need 2 bearings per wheel, joined by a spacer in the center of the wheel hub.

Bearings are often rated on the ABEC scale (typically ABEC 3 to 9). Higher numbers mean tighter manufacturing tolerances and often a higher price. For stunt scooters, seal quality, materials and how hard you ride matter just as much — bearings without an ABEC rating are not necessarily worse.

Scooter wheels / Spacers

Spacers are easy to overlook. The wrong spacer hurts bearing life and performance from day one.

Most wheels work well with a 10 mm spacer. Some brands recommend a specific width — either way, never ride without a spacer.

Scooter wheels / Spacer too wide

If the spacer is too wide and you press the bearing into the wheel, the outer race can be pushed inward while the inner race is pushed outward. That creates extra friction — slower wheels and shorter bearing life.

Signs of an incorrect spacer: slow-spinning wheels and damaged bearings.

Scooter wheels / Spacer too narrow

With no spacer or one that is too narrow, the inner race can be pushed inward while the outer race stays put. That also adds friction and shortens bearing life.

Signs of an incorrect spacer: slow-spinning wheels, damaged bearings, and axle bolts that need constant re-tightening.